In making a .45 cal. up on a shotgun action, I'd probably have Ron chamber it for the #2 case - or go all funky and get a .450 No1 Ex. THAT is a most LOVELY ctg. at 2 3/4" length for a double rifle for North American game even if you can't get copper tubed paper patched bullets any more - I could make something work very well indeed, but I need the rifle- anyone?